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Set an allocation hint when rematting before a COPY. 

This almost guarantees that the COPY will be coalesced.

llvm-svn: 125140
This commit is contained in:
Jakob Stoklund Olesen 2011-02-09 00:25:36 +00:00
parent 123b89b67f
commit 0b2f8d24b3
1 changed files with 4 additions and 0 deletions
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4
llvm/lib/CodeGen/InlineSpiller.cpp
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@ -154,6 +154,10 @@ bool InlineSpiller::reMaterializeFor(MachineBasicBlock::iterator MI) {
LiveInterval &NewLI = edit_->create(mri_, lis_, vrm_);
NewLI.markNotSpillable();
// Rematting for a copy: Set allocation hint to be the destination register.
if (MI->isCopy())
mri_.setRegAllocationHint(NewLI.reg, 0, MI->getOperand(0).getReg());
// Finally we can rematerialize OrigMI before MI.
SlotIndex DefIdx = edit_->rematerializeAt(*MI->getParent(), MI, NewLI.reg, RM,
lis_, tii_, tri_);